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(Units) one thousandth of a roentgen
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈmɪl əˌrɛnt gən, -dʒən, -ˌrʌnt-)

1/1000 of a roentgen. Abbr.: mR, mr
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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References in periodicals archive ?
An indicator shows the net radiation exposure in milliroentgens. Pocket ionization chambers generally are sensitive to exposures ranging from 0 to 200 mR.
the Department of Energy says we receive between 35 and 50 milliroentgens every year from the sun and from 20 to 35 milliroentgens every year from our food.
(57) Eriksen indicates the total radiation from study x-rays are estimated from 136 to 211 milliroentgens (mR) at skin entrance when using lead filters.